I'm having some issues with a DateRange field in one of my setups. The data is simply dropped on save in some cases. It seems like not even the validation code is executed. I can enter anything and the objects save successfully but the field remains empty.
I put a mysql dump for testing here on antwerp: /home/stefan/provenienz.sql. You can log in with stefan/stefan.
Try filling out the date ("Datierung") field on the "Info" screen for the objects BT_O_172 or BT_O_190.
Latest cleanup branch